subnet.im

Allocated but unannounced space

Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.

“Unannounced” does not mean “unused”

Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.

It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.

Browse by registry

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Countries with unannounced space registered through ARIN, largest first.

Unannounced blocks in United States

26,289 blocks match, ordered by prefix.

Allocated but unannounced blocks, 20001 to 20050 of 26289
PrefixAddressesRegistryCountryAllocated
2600:2200::/2868.7B × /64ARINUS30th Dec 2014
2600:2300::/2868.7B × /64ARINUS29th Jun 2015
2600:2400::/2934.4B × /64ARINUS7th Jun 2010
2600:2d00::/2868.7B × /64ARINUS25th Aug 2017
2600:3100::/2868.7B × /64ARINUS29th May 2018
2600:3200::/2868.7B × /64ARINUS19th Jun 2018
2600:3800::/2868.7B × /64ARINUS6th Jan 2011
2600:7800::/2868.7B × /64ARINUS25th Oct 2013
2600:7d00::/2868.7B × /64ARINUS27th Feb 2019
2600:8c00::/2868.7B × /64ARINUS10th Mar 2015
2600:a000::/2868.7B × /64ARINUS21st Aug 2015
2600:a400::/2868.7B × /64ARINUS14th Oct 2015
2600:b400::/324.3B × /64ARINUS2nd Apr 2018
2600:c14::/324.3B × /64ARINUS2nd Feb 2010
2600:c400::/2868.7B × /64ARINUS28th Aug 2020
2600:d000::/2868.7B × /64ARINUS30th Oct 2020
2601:1100::/2868.7B × /64ARINUS9th May 2022
2601:1500::/2868.7B × /64ARINUS15th Feb 2023
2601:1800::/2868.7B × /64ARINUS6th Oct 2023
2601:1a00::/241.1T × /64ARINUS1st Apr 2024
2601:1b00::/241.1T × /64ARINUS18th Apr 2024
2601:1e00::/241.1T × /64ARINUS13th Jun 2024
2601:3000::/2868.7B × /64ARINUS29th Aug 2024
2601:7000::/2868.7B × /64ARINUS3rd Jun 2025
2601:e000::/241.1T × /64ARINUS10th Apr 2023
2601:f000::/241.1T × /64ARINUS6th Jul 2023
2602:234::/36268M × /64ARINUS20th Sept 2023
2602:270::/36268M × /64ARINUS20th Dec 2021
2602:272::/36268M × /64ARINUS25th Jan 2022
2602:273::/36268M × /64ARINUS9th Feb 2022
2602:275::/36268M × /64ARINUS6th May 2022
2602:276::/324.3B × /64ARINUS26th May 2022
2602:27b::/324.3B × /64ARINUS27th Oct 2022
2602:27d::/36268M × /64ARINUS27th Oct 2022
2602:27e::/4016.8M × /64ARINUS27th Oct 2022
2602:27f::/36268M × /64ARINUS27th Oct 2022
2602:290::/36268M × /64ARINUS28th Oct 2022
2602:292::/4016.8M × /64ARINUS28th Oct 2022
2602:298::/36268M × /64ARINUS13th Jan 2023
2602:29a::/4016.8M × /64ARINUS18th Jan 2023
2602:29b::/4016.8M × /64ARINUS18th Jan 2023
2602:29d::/36268M × /64ARINUS19th Jan 2023
2602:2a7::/36268M × /64ARINUS6th Mar 2023
2602:2ab::/36268M × /64ARINUS6th Mar 2023
2602:2ae::/36268M × /64ARINUS7th Mar 2023
2602:2b8::/4016.8M × /64ARINUS22nd Mar 2023
2602:2b9::/4016.8M × /64ARINUS3rd Apr 2023
2602:2bf::/36268M × /64ARINUS7th Apr 2023
2602:2c1::/36268M × /64ARINUS18th Apr 2023
2602:2c2::/36268M × /64ARINUS18th Apr 2023